Add messages api

.editorconfig

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+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# TS/JS-Files
+[*.{ts,js}]
+indent_size = 2
+
+# JSON-Files
+[*.json]
+indent_style = tab
+
+# ReST-Files
+[*.rst]
+indent_size = 4
+max_line_length = 80
+
+# YAML-Files
+[*.{yaml,yml}]
+indent_size = 2
+
+# NEON-Files
+[*.neon]
+indent_size = 2
+indent_style = tab
+
+# package.json
+[package.json]
+indent_size = 2
+
+# TypoScript
+[*.{typoscript,tsconfig}]
+indent_size = 2
+
+# XLF-Files
+[*.xlf]
+indent_style = tab
+
+# SQL-Files
+[*.sql]
+indent_style = tab
+indent_size = 2
+
+# .htaccess
+[{_.htaccess,.htaccess}]
+indent_style = tab

Classes/Controller/MessageController.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the package slub/slub-profile-messages
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Slub\SlubProfileMessages\Controller;
+
+use Psr\Http\Message\ResponseInterface;
+use Slub\SlubProfileMessages\Domain\Model\Category;
+use Slub\SlubProfileMessages\Domain\Repository\MessageRepository;
+use Slub\SlubProfileMessages\Mvc\View\JsonView;
+use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
+
+class MessageController extends ActionController
+{
+    protected $view;
+    protected $defaultViewObjectName = JsonView::class;
+    protected MessageRepository $messageRepository;
+
+    /**
+     * @param MessageRepository $messageRepository
+     */
+    public function __construct(MessageRepository $messageRepository)
+    {
+        $this->messageRepository = $messageRepository;
+    }
+
+    /**
+     * @param Category $category
+     * @return ResponseInterface
+     */
+    public function listAction(Category $category): ResponseInterface
+    {
+        $messages = $this->messageRepository->findByCategoryUid(
+            $category->getUid(),
+            (int)$this->settings['message']['list']['limit']
+        );
+
+        $this->view->setVariablesToRender(['messageList']);
+        $this->view->assign('messageList', $messages);
+
+        return $this->jsonResponse();
+    }
+}

Classes/Domain/Model/Category.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the package slub/slub-profile-messages
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Slub\SlubProfileMessages\Domain\Model;
+
+use TYPO3\CMS\Extbase\DomainObject\AbstractEntity;
+
+class Category extends AbstractEntity
+{
+    protected string $title = '';
+    protected string $code = '';
+
+    /**
+     * @return string $title
+     */
+    public function getTitle(): string
+    {
+        return $this->title;
+    }
+
+    /**
+     * @param string $title
+     */
+    public function setTitle(string $title): void
+    {
+        $this->title = $title;
+    }
+
+    /**
+     * @return string $code
+     */
+    public function getCode(): string
+    {
+        return $this->code;
+    }
+
+    /**
+     * @param string $code
+     */
+    public function setCode(string $code): void
+    {
+        $this->code = $code;
+    }
+}

Classes/Domain/Model/Message.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the package slub/slub-profile-messages
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Slub\SlubProfileMessages\Domain\Model;
+
+use DateTime;
+use TYPO3\CMS\Extbase\Annotation as Extbase;
+use TYPO3\CMS\Extbase\DomainObject\AbstractEntity;
+use TYPO3\CMS\Extbase\Persistence\ObjectStorage;
+
+class Message extends AbstractEntity
+{
+    protected string $title = '';
+    protected string $content = '';
+    protected ?DateTime $datetime = null;
+    /**
+     * @Extbase\ORM\Lazy
+     * @var ?ObjectStorage<Category>
+     */
+    protected ?ObjectStorage $categories = null;
+
+    /**
+     * Message constructor.
+     */
+    public function __construct()
+    {
+        $this->categories = new ObjectStorage();
+    }
+
+    /**
+     * @return string $title
+     */
+    public function getTitle(): string
+    {
+        return $this->title;
+    }
+
+    /**
+     * @param string $title
+     */
+    public function setTitle(string $title): void
+    {
+        $this->title = $title;
+    }
+
+    /**
+     * @return string $content
+     */
+    public function getContent(): string
+    {
+        /** @extensionScannerIgnoreLine */
+        return $this->content;
+    }
+
+    /**
+     * @param string $content
+     */
+    public function setContent(string $content): void
+    {
+        $this->content = $content;
+    }
+
+    /**
+     * @return DateTime $datetime
+     */
+    public function getDatetime(): DateTime
+    {
+        return $this->datetime;
+    }
+
+    /**
+     * @param DateTime $datetime
+     */
+    public function setDatetime(DateTime $datetime): void
+    {
+        $this->datetime = $datetime;
+    }
+
+    /**
+     * @return ObjectStorage<Category>
+     */
+    public function getCategories(): ?ObjectStorage
+    {
+        return $this->categories;
+    }
+
+    /**
+     * @param ObjectStorage $categories
+     */
+    public function setCategories(ObjectStorage $categories): void
+    {
+        $this->categories = $categories;
+    }
+}

Classes/Domain/Repository/CategoryRepository.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the package slub/slub-profile-messages
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Slub\SlubProfileMessages\Domain\Repository;
+
+use TYPO3\CMS\Extbase\Persistence\Repository;
+
+class CategoryRepository extends Repository
+{
+}

Classes/Domain/Repository/MessageRepository.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the package slub/slub-profile-messages
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Slub\SlubProfileMessages\Domain\Repository;
+
+use TYPO3\CMS\Extbase\Persistence\QueryInterface;
+use TYPO3\CMS\Extbase\Persistence\QueryResultInterface;
+use TYPO3\CMS\Extbase\Persistence\Repository;
+
+class MessageRepository extends Repository
+{
+    protected $defaultOrderings = [
+        'datetime' => QueryInterface::ORDER_DESCENDING
+    ];
+
+    /**
+     * @param int $categoryUid
+     * @param int $limit
+     * @return QueryResultInterface
+     */
+    public function findByCategoryUid(int $categoryUid, int $limit = 10): QueryResultInterface
+    {
+        $query = $this->createQuery();
+        $constraint = $query->equals('categories.uid', $categoryUid);
+
+        $query->matching($constraint);
+        $query->setLimit($limit);
+
+        return $query->execute();
+    }
+}